Industry: 3612—Power, Distribution, and Specialty Transformers
Establishments primarily engaged in manufacturing power, distribution, instrument, and specialty transformers. Establishments primarily engaged in manufacturing radio frequency or voice frequency electronic transformers, coils, or chokes are classified in Industry 3677, and those manufacturing resistance welder transformers are classified in Industry 3548.

Airport lighting transformersLine voltage regulators
Auto-transformers for switchboards, except telephone switchboardsLuminous tube transformers
Auto-transformers, electric (power transformers)Machine tool transformers
Ballasts for lighting fixturesRatio transformers
Control transformersRectifier transformers
Current limiting reactors, electricalSignaling transformers electric
Distribution transformers electricSpecialty transformers
Doorbell transformers, electricStreet lighting transformers
Electric furnace transformersToy transformers
Feeder voltage regulators and boosters (electric transformers)Transformers, electric power
Fluorescent ballasts (transformers)Transformers, for electronic meters
Generator voltage regulators electric induction and step typeTransformers, reactor
Ignition transformersTripping transformers
Instrument transformers except portableVibrators interrupter
Isolation transformersVoltage regulating transformers electric power
Lighting transformers, fluorescentVoltage regulators, transmission and distribution
Lighting transformers, street and airport
Codes Titles Number of US Businesses
3612Power, Distribution and Specialty Transformers741
361200Power, distribution and specialty transformers316
36120000Power, distribution and specialty transformers316
361201Power and distribution transformers282
36120100Power and distribution transformers59
36120101Autotransformers, electric (power transformers)15
36120102Control transformers9
36120103Current limiting reactors, electrical11
36120104Distribution transformers, electric35
36120105Feeder voltage boosters (electric transformers)3
36120106Feeder voltage regulators (electric transformers)1
36120107Generator voltage regulators9
36120108Line voltage regulators15
36120109Power transformers, electric74
36120110Transmission and distribution voltage regulators15
36120111Voltage regulating transformers, electric power22
36120112Voltage regulators, transmission and distribution14
361202Lamp ballasts23
36120200Lamp ballasts1
36120201Ballasts for lighting fixtures16
36120202Fluorescent ballasts6
361203Specialty transformers107
36120300Specialty transformers42
36120301Airport lighting transformers2
36120302Autotransformers for switchboards (exc. tele. switchboards)2
36120303Doorbell transformers, electric6
36120304Electric furnace transformers2
36120305Electronic meter transformers13
36120306Fluorescent lighting transformers6
36120307Ignition transformers, for use on domestic fuel burners4
36120308Lighting transformers, fluorescent9
36120309Lighting transformers, street and airport2
36120310Luminous tube transformers0
36120311Machine tool transformers5
36120313Reactor transformers1
36120314Rectifier transformers3
36120315Signaling transformers, electric5
36120316Toy transformers4
36120317Tripping transformers1
361299Power, distribution and specialty transformers, nec13
36129901Instrument transformers (except portable)6
36129902Saturable reactors1
36129903Vibrators, interrupter6